What the Global Hunger Index measures and who publishes it

Background

The Global Hunger Index report is prepared by 'Welthungerhilfe' and 'Concern Worldwide'.
The Global Hunger Index is based on four indicators - Undernourishment, Child Stunting, Child Wasting and Child Mortality.
In the Global Hunger Index 2021 report, India's score was 27.5 and India was ranked 101 among 116 countries.
The Food and Agriculture Organisation (FAO) of the United Nations is the data source agency for the indicator 'Prevalence of Undernourishment'.
In a written reply in Lok Sabha, the Union Minister of Women and Child Development, Smt. Smriti Zubin Irani, stated that out of the four indicators only one, undernourishment, is directly related to hunger, and that Stunting and Wasting are outcomes of complex interactions of various other factors like sanitation, genetics, environment and utilisation of food intake.
The reply also noted that as per the National Family Health Survey, Child Stunting fell from 38.4% (NFHS-4, 2015-16) to 35.5% (NFHS-5, 2019-21) and Child Wasting from 21.0% to 19.3% over the same surveys.